Lighting fixture



June 10, 1941. H. G, ALM

LIGHTING FIXTURE vFiledJan. I2, 1939 Patented June 10, 1941 uon'rmc mum Henry G Alm, Elkhart, Ind assignor to The Adlake Company, a corporation of Illinois Application January 1:, 1e39, SerialNo. 250,546

(or. zit-7.3)

The principal object of the present invention is to provide a well ventilated lighting fixture which is simple in construction, pleasing in appearance, and one which will furnish a concentrated light area and at the same time will provide diffused lighting so as to furnish an adequate amount of general illumination.

Other objects and advantages will become apparent as the disclosure proceeds and the description is read in coniunction with the accompany- I ing drawing, in which Fig. 1 is a front elevational view of the lighting fixture iully assembled, showing the lenses and some oi the ventilating slots;

Fig. 2 is a top view of the fixture shown in Fig. 1;

Fig. 3 is a transverse sectional view taken on the line 3-4 of Fig. 4; and

Pig. 4 is an enlarged longitudinal sectional view taken on the line 44 of Fig. 3.

A particular embodiment of the invention is selected for the purpose of disclosure only in compliancewith Section 4888 of the Revised Statutes, and it is recognized that many modifications and changes can be made without departing from the present invention.

The lighting fixture forming the subject matter of the present invention is particularly well suited for use as a berth light in a railway sleeping car and comprises, broadly, a cover II, a pair of lenses Ii and ii, an electric bulb II, and a reflector i4 positioned behind the bulb.

. As best shown in Figs. 1 and 2, lenses II and I! extend. lengthwise of the lighting fixture and are positioned below and above, respectively, the longitudinal center line of the fixture. Lens ii is a condensing lens adapted to concentrate a portion of the light issuing from the bulb ll onto the reading plane of the passenger using the light and is supported on the cover II by a supporting strip ll amxed along its one edge to the cover I I, and by a flanged channel member I, which in turn is held in place by a plurality oi machine screws I'l.

The lens i2 is a diflusing lens made ofsome translucent material and is supported on the cover I. by a l'bar ll aflixed to the cover ll along one edge and by the flanged channel member IO.

As best shown in Pig. 4, the cover'i I is provided with a plurality of integral lugs IO, and a back plate 2| (see Fig. 3) is secured to the cover by means of machine screws 2| which thread into the lugs II. The reflector I4 is carried by the back plate 20, and machine screws 22 serve as the securing means.

An electric socket 23 is secured to the back plate 20 by a bracket 24, and the light bulb i3 screws into the socket. When the fixture is fully assembled with its back in place, the unit may be mounted on the wall, generally indicated in Fig.

' 3 at 25, by hooking it onto screws 28, previously threaded into the wall. The screw heads enter the large portions of keyhole slots 21, and then the unit is lowered so as to move the shank of the screws into the narrow portions .of the slots.

The refiector H is so positionedwith respect to the light bulb I3 and the lenses II and i2 that the majority of light reflected from its surface passes through the condensing lens II, thereby directing more light through this, lens than through the light diffusing lens ll. In this manner, the majority of light issuing from the light bulb is utilized for illuminating the reading plane and only a minor portion of the light is utilized for general illumination purposes.

Longitudinal slots 22 are provided at the top and at the bottom of the fixture between the lensu and the wall, and other slots 29 are provided at both ends of the fixture. The function of these slots, in addition to their decorative value. is to provide additional ventilation for the interior of the fixture.

Electrical conductors It and II pass through the fixture back 2| and are electrically connected to the socket 23 in any well known manner.

Although the reflector i2 is shown as being separate from the back 20, obviously a reflecting surface could be provided on the inside face of the back 20; but it should be so arranged with respect to the light bulb i3 and the condensing lens li that the majority of light reflected from this reflecting surface passes through condensing lens Ii.

A shield I2 is positioned between the electric light bulb and the lower ventilating slot (as shown in Fig. 3) so as to intercept any light rays that might otherwise pass through the ventilating slot.

I claim:

' 1. A lighting fixture comprising a back plate adapted to be mounted on a substantially fiat surface, an elongated bowl-shaped cover substantially symmetrical with respect to its longitudinal axis and having elongated openings on opposite sides of the plane of symmetry, an elongated light bulb in the fixture behind the cover and disposed lengthwise of the cover, mounting means for supporting the bulb close to the back plate and adapted to connect it to a circuit, a pair of light transmitting members including an elongated light collecting lens positioned in one of the openings in the ,cover and extending at least approximately the length of the bulb, and a light diffusing member in the other of said openings in the cover extending at least approximately the length of the-bulb, an elongated refiector extending longitudinally of the bulb and disposed rearwardly thereof to reflect light therefrom through one of the light transmitting members, said cover substantially concealing said bulb, reflector and mounting means.

2. A lighting fixture comprising a back plate adapted to be mounted'on a substantially flat surface, an elongated bowl-shaped cover substantially symmetrical with respect to its longitudinal axis and having elongated openings on opposite sides of the plane of symmetry, an elongated light bulb in the fixture behind the cover and disposed lengthwise of the cover, mounting means for supporting the bulb close to the back plate and adapted to connect it to a circuit, a pair of light transmitting members including an elongated light collecting lens positioned in one of the openings in the cover and extending at least approximately the length of the bulb, and a light diil'using member in the other of said openings in the cover extending at least approximately the length of the bulb, an elongated reflector extending longitudinally of the bulb and disposed rearwardly thereof and curved about the bulb to reflect light therefrom through one of the light transmitting members, said cover substantially concealing said bulb, reflector and mounting means.

3. A lighting fixture comprising a back plate adapted to be mounted on a substantially flat surface, an elongated bowl-shaped cover substantially symmetrical with respect to its longitudinal axis and having elongated openings on opposite sides of the plane of symmetry, an elongated'light bulb in the fixture behind the cover and disposed lengthwise of the cover, mounting means for supporting the bulb close to the back plate and adapted to connect it to a circuit, a pair of light transmitting members including an elongated light collecting lens positioned in one of the openings in the cover and extending at least approximately the length of, the bulb, and a light diffusing member in the other of said openings in the cover extending at least approximately the length of the bulb, an

elongated reflectorextending longitudinally of the bulb and disposed rearwardly thereof to refiect light therefrom through the light collecting lens, said cover substantially concealing said bulb, reflector and mounting means.

4. A lighting fixture comprising a back plate adapted to be mounted on a substantially flat surface, an elongated bowl-shaped cover substantially symmetrical with respect to its 1ongitudinal axis and having elongated openings on opposite sides of the plane of symmetry, an elongated light bulb in the fixture behind the cover and disposed lengthwise of the cover, mounting means for supporting the bulb close to the back plate and adapted to connect it to a circuit, a pair of light transmitting members including an elongated light collecting lens positioned in one of the openings in the cover and extending at least approximately the length of the bulb, and a light diffusing member in the other of said openings in the cover extending at least approximately the length of the bulb, an elongated refiector extending longitudinally of the bulb and disposed rearwardly thereof and curved about the bulb to reflect light therefrom through the light collecting lens, said cover substantially concealing said bulb, reflector and mounting means.

5. A lighting fixture comprising a back plate adapted to be mounted on a substantially flat surface, an elongated bowl-shaped cover having elongated openings on opposite sides of a plane of symmetry extending longitudinally of the cover, an elongated light bulb in the fixture behind the cover and disposed lengthwise of the cover, mounting means for supporting the bulb close to the back plate and adapted to connect it to a circuit, a pair of light transmitting members including an elongated light collecting lens positioned in one of the openings in the cover and extending at least approximately the length of the bulb, and a light diffusing member in the other of said openings in the cover extending at least approximately the length of the bulb, an elongated reflector extending longitudinally of the bulb and disposed rearwardly thereof to re flect light therefrom through one of the light transmitting members, said cover substantially concealing said bulb, reflector and mounting means, the outside surfaces of the collecting lens and diffusing member being substantially symmetrical about the plane of symmetry.

HENRY G. ALM. 

